For a woman in her mid-30s, which of the following is/are a common occurrence?

Which of the following is/are a common occurrence for a woman in her mid-40s who is still having mostly regular cycles with occasional irregularly-timed cycles?

For a woman in her early 50s who is beginning to have erratically timed cycles, which of the following is/are a common occurrence?

For a woman in her mid-50s who has not had menses x 16 months, which of the following is/are a common occurrence?

Once menstruation has ceased…

By the time periods have ceased entirely…

Androgens…